Question 3 Express cot 85° + cos 75° in terms of trigonometric ratios of angles between 0° and 45°. cot 85° + cos75° = cot (90° − 5) + cos (90° − 15°) = tan 5° + sin 15° Hence required value is tan 5° + sin 15°

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Davneet Singh

Davneet Singh has done his B.Tech from Indian Institute of Technology, Kanpur. He has been teaching from the past 13 years. He provides courses for Maths, Science, Social Science, Physics, Chemistry, Computer Science at Teachoo.

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